Current regulator



Feb. 12, 1924.- 1,483,629

S. RUTTENBERG ET AL CURRENT REGULATOR Filed July 13 1922 ME LQ/bOW/fl I VENTORj 5. Ruffenbery A ORNEY 40 ed and ready Patented Feb. 12,- 1924.

UNITED STATES PATENT OFFICE.

8mm. BUTTENBEBG AND MEYER r. nnrnowrrz, or NEW roan, 1w. Y.

CURRENT REGULATOR.

Application filed July 13;

To all whom it may concern:

Be it known that we, SAMUEL RU'r'rEN- BERG and MEYER F. LEIBOWITZ, citizens of the United States, residents of New York,

inthe county of New York and State of New York, have invented certain new and .useful Improvements in CurrentRegulators,

of which the following is a specification.

v This invention relates to improvements in current regulators and is particularly designed for use in connection with what are commonly known in the wireless telegraphyand telephony art as vacuum tubes.

The 0 ject of the invention resides in the provision of a device by which the proper quantity of current is passed through the vacuum tube at all times, without t e necessity of providing the usual wire-wound rheostat, which while acting satisfactorily in many ways, is liable through misadjustment, to pass too much current and cause the tungsten filament to be burnt out.

Another ob'ect of the invention is to provide a device aving a novel means for su porting the resistance element, which Wlll hereinafter be termed a filament, in proper osition within the capsule forming the ody of the re ulator.

A further 0 ject of the invention is to so pre are the filament as to prevent it from oxidizing and deteriorating.

These and other analogous objects are attained by the novel design, construction and arran ement of parts hereinafter described and sliown in the accompanying drawing, forming an essential part of this disclosure, and in which Figure 1 is a plan view of the improve current regulator showing the same mountfor use.

Fi e 2 1s a side view of Figure 1. I Figure 3 is a transverse sectional view taken on line 3-3 of Figure 2.

Fi re 4 is a detail view of the filament attac ent. 4 Figure 5 is a detail sectional view taken on line 55 of Figure 4.

' Figure 6 is a longitudinal sectional view throu h a modified form of the regulator. Re erring to the drawing the numeral 10 desi ates a base preferably formed of insu ating material, and rovided on adpartly in section jaeent opposite ends with posts 11,

1922. Serial No. 574,805.

in electrical contact with which are angularly extending In 12.

The capsule is esignated genericall by the numeral 13 and comprises a tubular ody 14 of glass or a similar material, the ends 15 of which are closed to provide a substantially air tight structure.

Lead wires 16, formed of white metal or any other suitable conductive substance having approximately the. same coeflicient of expansionof the material from which the tube 14 is formed, and extending through the end closures 15, sealedand connected to the inner ends of the wire 16, is'a filament 17, formed of iron wire or any otherjsuitable material, .having a large temperature coefiicient of resistance. As shown in Figures 4 and 5, the ends of the wires 16, are flattened and bent, as

at 18, to form a transversely U shaped clamping means which is engaged around the ends of the filament 1'1 as clearly shown in Figu Metallic caps 19- are then cemented to the ends of the body 14 and the devicemounted, as shown in Figures '1 and 2, and the re 5. a

wires 16 bent around and soldered to the caps 19. The complete cartridge or capsule is then slipped between lugs 12 and held by perforations in the latter. I

In the modification illustrated in Figure 6, the tube or capsule is designated by the numeral 20 andthe lead wires 21, are sealed in the ends and connected, by the filament 22. In this type of device, however, the end caps are eliminated and the device mounted in the circuit in any suitable manner.

A-highly important feature in the production of such a device is to so prepare the filament as to prevent oxidization and to accomplish this result, the iron filament prior to being introduced into the capsule, is preferably dipped in a mixture of alcohol and phosphorus. Any other suitable method or material may be employed which will re: duce the desired results. After intr uction into the capsulethe device is connected so that an" initial current is passed through the filament and its t em rature raised to approximately 500 degrees This action causes the phosphorus to unite with the oxygen in the tube, thus preventingthe filament from oxidization when in use.

It has. also been found that the oxygen in the capsule can be absorbed by putting a small amount of the phosphorus mixture inside the tube before sealing. The heat of the glass durin sealing will heat the phosphorus to the esired temperature.

By providing an alkaline coating on the filament deterioration of the latter will be prevented.

While certain preferred embodiments of this device have been shown and described, it will be understood that changes in the form, arrangements, proportions, sizes and details thereof, may be made without departin from the scope of the invention as define in the appended claims.

Having thus described our invention, what we claim as new and desire to secure by Letters Patent, is

1. A device in cartridge form for automatic regulation of the current in an audion tube filament.

2. A current regulator in cartridge form for vacuum tubes comprising a capsule, lead wires extending through opposite ends of the capsule, a filament clamped to the inner ends of the lead wires, and a coating applied to the filament prior to its introduction into the capsule when the temperature of the filament is raised within certain limits.

3. A current regulator in cartridge form for vacuum tubes comprising a capsule, lead Wires extendin through opposite ends of the capsule, a ament connecting the inner ends of the lead wires and means associated with the filament for reducing the oxygen content of the capsule when the temperature of the filament is raised to a predetermined degree.

4. A current regulator in cartridge form for vacuum tubes comprising a capsule, lead wires extendin through opposite ends of the capsule, a lament clamped to the inner ends of the lead wires, and a coating applied to the filament prior to its introduction into the capsule for reducin the oxygen content of the capsule when the temperature of the filament is raised with certain limits.

5. A current regulator in cartridge form for vacuum tubes comprising a capsule, lead wires extendin through opposite ends of the capsule, a filament connecting the inner ends of the lead wires, means associated with the filament for reducing the oxygen content of the capsule when the temperature of the filament is raised to a predetermined degree, and an alkaline coating for the filament to prevent corrosion.

6. A current regulator in cartridge form for vacuum tubes comprising a capsule, lead wires extending through opposite ends of the capsule, a filament connecting the inner ends of the lead wires, and a phosphoretic coating on said filament for reducing the oxygen content of the capsule when said filament is raised in temperature.

7 A current regulator in cartridge form for vacuum tubes comprising a capsule, lead wires extending through opposite ends of the capsule, said lead wires having spatulate inner ends bent to produce op osed clamping surfaces, a filament engaged between the clamping surfaces in electrical contact therewith, and a protective coating applied to said filament.

Signed at New York in the county of New York and State of New York this 26thday of May, A. D. 1922.

MEYER F. LEIBOWITZ. SAMUEL RUTTENBERG. 

